Juniper SERVICE AVAILABILITY - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 50

JUNOSe 11.1.x Service Availability Configuration Guide
When stateful SRP switchover is enabled, an SRP switchover keeps line modules up
and forwarding data, and the newly active SRP module continues from the point of
switchover.
By using transaction-based mirroring instead of file synchronization, high availability
mode keeps the standby SRP module synchronized with the active SRP module.
Mirroring occurs from memory on the active SRP module to memory on the standby
SRP module by way of transactions. When a transaction is committed on the active
SRP module, the data associated with the transaction is sent to the standby SRP
module.
In high availability mode:
NOTE: Configuration files are always synchronized. Nonconfiguration files are
synchronized when the disable-autosync command has not been configured; this
is the default case. When the disable-autosync command has been configured,
nonconfiguration files are not synchronized.
NOTE: If the switchover does not finish within 5 minutes, the SRP module cancels
the operation and reenables CLI configuration.
Related Topics
28
Stateful SRP Switchover Redundancy Modes
The contents of the NVS in the primary and standby SRP modules remain
synchronized.
If a switchover occurs:
The standby SRP module warm-restarts using the mirrored data to restore
itself to the state of the system before the switchover.
During the warm restart:
User connections remain active, and forwarding continues through the
chassis.
New user connection attempts during switchover are denied until
switchover is complete.
New configuration changes are prevented until switchover is complete
(or after 5 minutes).
Stateful SRP Switchover States on page 29
disable-autosync
redundancy
mode